Consolidated Statement Of Total Equity (USD $) Share data in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Beginning Balance at Dec. 31, 2010	$ 455,000	$ 396,485,000	$ (53,660,000)	$ 1,082,160,000	$ 1,425,440,000	$ 42,819,000	$ 1,468,259,000
Beginning Balance, Shares at Dec. 31, 2010	45,579
Consolidated net earnings				18,385,000	18,385,000	(227,000)	18,158,000
Adjustment for funded status of pension and postretirement benefit plans, net of tax of $6,035			3,169,000		3,169,000	2,000	3,171,000
Foreign currency translation gain			886,000		886,000		886,000
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, net of tax of $188			286,000		286,000		286,000
Consolidated comprehensive earnings					22,726,000	(225,000)	22,501,000
Dividends declared				(36,813,000)	(36,813,000)		(36,813,000)
Issuances of common stock for stock award plans	1,000	(1,524,000)			(1,523,000)		(1,523,000)
Issuances of common stock for stock award plans, shares	102
Stock-based compensation expense		6,351,000			6,351,000		6,351,000
Distributions to owners of noncontrolling interests						(1,000,000)	(1,000,000)
Purchase of remaining interest in existing limited liability company		(3,737,000)			(3,737,000)	(3,439,000)	(7,176,000)
Ending Balance at Jun. 30, 2011	$ 456,000	$ 397,575,000	$ (49,319,000)	$ 1,063,732,000	$ 1,412,444,000	$ 38,155,000	$ 1,450,599,000
Ending Balance, Shares at Jun. 30, 2011	45,681